I've not had a huge amount of time to play, so still only level 8. Did the first few parts of the main quest before getting endlessly sidetracked by all the side missions. Currently working my way through the Companions stuff. I've seen 3 dragons so far other than the one from the start of the game. Killed 2 of them, though the 3rd seemed to be on a bit of a sight seeing tour and stayed up too high for me to get it to come down to attack.
I seem to be doing quite well with a combination of 1 handed sword and destruction magic attacks. I love the special attacks that sometimes trigger with the sword. When I get around to rolling again I might go pure magic, as there are some really hard enemies that I have to keep my distance from and burn down with magic before rushing in for a finishing blow.